How do I solve the problem "HDMI High definition Audio Device not plugged in"? I have an . HP Probook 4720s with energy star, with AtiMobility Radeon 54500 series (HD 530 v) card. This was a problem years ago; through the HP forum I received a new driver which solved the problem. Now after I upgraded to Windows 10 I have the problem again and appreciate any help to get it solved.